Update dependency NServiceBus.TransactionalSession to 4.0.0-alpha.2 (#783)

Co-authored-by: dependencyupdates[bot] <218638057+dependencyupdates[bot]@users.noreply.github.com>

Author: dependencyupdates[bot]

src/NServiceBus.Storage.MongoDB.TransactionalSession/NServiceBus.Storage.MongoDB.TransactionalSession.csproj

@@ -12,7 +12,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="NServiceBus.TransactionalSession" Version="4.0.0-alpha.1" />
+    <PackageReference Include="NServiceBus.TransactionalSession" Version="4.0.0-alpha.2" />
     <PackageReference Include="Particular.Packaging" Version="4.4.0" PrivateAssets="All" />
   </ItemGroup>